GraphicsMagick 1.3.26 has a heap overflow in the WriteCMYKImage() function in coders/cmyk.c when processing multiple frames that have non-identical widths.Referenceshttp://hg.code.sf.net/p/graphicsmagick/code/rev/d00b74315a71https://www.debian.org/security/2018/dsa-4321https://lists.debian.org/debian-lts-announce/2018/06/msg00009.htmlhttp://www.securityfocus.com/bid/100357https://usn.ubuntu.com/4222-1/
